Buggy code:
public abstract class Matcher extends IntHolder { protected final Regex regex ; protected final Encoding enc ; protected final byte [ ] bytes ; protected final int str ; protected final int end ; protected int msaStart ; protected int msaOptions ; protected final Region msaRegion ; protected int msaBestLen ; protected int msaBestS ; protected int msaBegin ; protected int msaEnd ; public Matcher ( Regex regex , byte [ ] bytes ) { } public Matcher ( Regex regex , byte [ ] bytes , int p , int end ) { } protected abstract int matchAt ( int range , int sstart , int sprev ) { } protected abstract void stateCheckBuffInit ( int strLength , int offset , int stateNum ) { } protected abstract void stateCheckBuffClear ( ) { } public final Region getRegion ( ) { } public final Region getEagerRegion ( ) { } public final int getBegin ( ) { } public final int getEnd ( ) { } protected final void msaInit ( int option , int start ) { } public final int match ( int at , int range , int option ) { } int low ; int high ; private boolean forwardSearchRange ( byte [ ] bytes , int str , int end , int s , int range , IntHolder lowPrev ) { int pprev = - 1 ; int p = s ; if ( Config . DEBUG_SEARCH ) { log . println ( ( ( ( ( ( ( ( ( "forward_search_range:<seq2seq4repair_space>" + "str:<seq2seq4repair_space>" ) + str ) + ",<seq2seq4repair_space>end:<seq2seq4repair_space>" ) + end ) + ",<seq2seq4repair_space>s:<seq2seq4repair_space>" ) + s ) + ",<seq2seq4repair_space>range:<seq2seq4repair_space>" ) + range ) ) ; } if ( ( regex . dMin ) > 0 ) { if ( enc . isSingleByte ( ) ) { p += regex . dMin ; } else { int q = p + ( regex . dMin ) ; <START_BUG> while ( p < q ) <END_BUG> p += enc . length ( bytes , p , end ) ; } } retry : while ( true ) { p = regex . searchAlgorithm . search ( regex , bytes , p , end , range ) ; if ( ( p != ( - 1 ) ) && ( p < range ) ) { if ( ( p - ( regex . dMin ) ) < s ) { pprev = p ; p += enc . length ( bytes , p , end ) ; continue retry ; } if ( ( regex . subAnchor ) != 0 ) { switch ( regex . subAnchor ) { case AnchorType . BEGIN_LINE : if ( p != str ) { int prev = enc . prevCharHead ( bytes , ( pprev != ( - 1 ) ? pprev : str ) , p , end ) ; if ( ! ( enc . isNewLine ( bytes , prev , end ) ) ) { pprev = p ; p += enc . length ( bytes , p , end ) ; continue retry ; } } break ; case AnchorType . END_LINE : if ( p == end ) { if ( ! ( Config . USE_NEWLINE_AT_END_OF_STRING_HAS_EMPTY_LINE ) ) { int prev = enc . prevCharHead ( bytes , ( pprev != ( - 1 ) ? pprev : str ) , p , end ) ; if ( ( prev != ( - 1 ) ) && ( enc . isNewLine ( bytes , prev , end ) ) ) { pprev = p ; p += enc . length ( bytes , p , end ) ; continue retry ; } } } else if ( ( ! ( enc . isNewLine ( bytes , p , end ) ) ) && ( ( ! ( Config . USE_CRNL_AS_LINE_TERMINATOR ) ) || ( ! ( enc . isMbcCrnl ( bytes , p , end ) ) ) ) ) { pprev = p ; p += enc . length ( bytes , p , end ) ; continue retry ; } break ; } } if ( ( regex . dMax ) == 0 ) { low = p ; if ( lowPrev != null ) { if ( ( low ) > s ) { lowPrev . value = enc . prevCharHead ( bytes , s , p , end ) ; } else { lowPrev . value = enc . prevCharHead ( bytes , ( pprev != ( - 1 ) ? pprev : str ) , p , end ) ; } } } else { if ( ( regex . dMax ) != ( MinMaxLen . INFINITE_DISTANCE ) ) { low = p - ( regex . dMax ) ; if ( ( low ) > s ) { low = enc . rightAdjustCharHeadWithPrev ( bytes , s , low , end , lowPrev ) ; if ( ( lowPrev != null ) && ( ( lowPrev . value ) == ( - 1 ) ) ) { lowPrev . value = enc . prevCharHead ( bytes , ( pprev != ( - 1 ) ? pprev : s ) , low , end ) ; } } else { if ( lowPrev != null ) { lowPrev . value = enc . prevCharHead ( bytes , ( pprev != ( - 1 ) ? pprev : str ) , low , end ) ; } } } } high = p - ( regex . dMin ) ; if ( Config . DEBUG_SEARCH ) { log . println ( ( ( ( ( ( ( ( ( "forward_search_range<seq2seq4repair_space>success:<seq2seq4repair_space>" + "low:<seq2seq4repair_space>" ) + ( ( low ) - str ) ) + ",<seq2seq4repair_space>high:<seq2seq4repair_space>" ) + ( ( high ) - str ) ) + ",<seq2seq4repair_space>dmin:<seq2seq4repair_space>" ) + ( regex . dMin ) ) + ",<seq2seq4repair_space>dmax:<seq2seq4repair_space>" ) + ( regex . dMax ) ) ) ; }

Fix:
while ( ( p < q ) && ( p < end ) )